Fix variable name

Author: joshafeinberg

affectedmoduledetector/src/main/kotlin/com/dropbox/affectedmoduledetector/AffectedModuleDetectorPlugin.kt

@@ -255,7 +255,7 @@ class AffectedModuleDetectorPlugin : Plugin<Project> {
     private fun requireConfiguration(project: Project): AffectedModuleConfiguration {
         return requireNotNull(
             value = project.rootProject.extensions.findByName(AffectedModuleConfiguration.name),
-            lazyMessage = {  "Unable to find ${AffectedTestConfiguration.name} in ${project.rootProject}" }
+            lazyMessage = {  "Unable to find ${AffectedModuleConfiguration.name} in ${project.rootProject}" }
         ) as AffectedModuleConfiguration
     }